Screw machine



l Mamhzo, 1945- KINGslNsER ETAL 2,372,004

' scREw MACHINE Filed Aug. 5, 1942 2 Sheets-Sheet 1 z f f w, v

March 20, 19,45 R. KINGslNER E-rAL- 2,372,004

SCREW MACHINE Filed Aug. 5, 1942 2 sheets-sheet 2 Patented Mar. 20, 1945 5w. f,

l UNITED STATES OFFICE *SCREW Roland Kingsnger, George .inlchamtndwilliam- FreglQQDet'roit, Mich., assignors to L. A. Young Spring; vand WireCorporatiomDetroit, Micheal 'corporation'ofMichigan 'Applicatinnnugustla 194.12, swirls-Assess reclaim. (Cisa-424) j y y .The main` objectsot thisinventionare:

First, to provide; a: screw :machine .for ,forming undercuts on. workqwhiclr, :permits 'the use of. a

simpley tool and. one.v whiclrmayv be `ground by'k a mechanic of average skill.

Second, to provide:=a.screw Ymachine which if r`of very large capacity and. well adaptedfor `the undercutting of. grooves inshells to adapt the grcovesztn receiveriflingband's or collars.v

Third, to provide ascrew machine designed for thisA purpose in, whichlethe tools. are retracted from the work in .-such.1nanner asnot to :damag thetool or the-work.

Fourth, to A provide a .screwv machine' .having theseadwantages which is largely automatic in its opera-tion and may be, accuratelyand. easily adjusted to particular work. l

Objects. relating `to details and `economies oi the invention will. appear from. the; description to follow. The invention isdened. in theclaims.

V A `machine which embodies the features-of the `invention is clearly illustratedin;thefaiccompanyi ing drawings, in which: ,v

Fig. 1 is a fragmentary View-partial1r.insec; tion oa turrettype of screwfmachinee embodying theieaturesof-this,invention,only'suchporiions t Eig. 5, is .a fragmentary front.end-elevationmf the tool. holder yand -certain -of itsv supporting;Y and cooperating parts. y Eig. 6 is a ,perspective view of the toolslide.,

Fig..'1 is a `.perspective view of theftoolnfholder with the tool .mountedtherein F'g. 8 fis aninverted. perspective tool or cutter. .y Y

'In the accompanyingv drawings we have illus- .trated-..onlysuch parts .of ascrew .machine asrseem ,pertinent .to an understandingv of. the invention and. to illustrate an embodiment: thereof i-n a wellknowln type `of lathe. l f

In the drawings l represents-` the frame ofthe rxiachir-ie` and 2. the. turretfwhich :isprovided with a plurality of. live spindles ,providedswith chucks View I of ythe is indicatedatjdf. This-'Work isa shell having an annular groove 5f thereinl 'adapted toA receive a rilifng band 'or Golia-r of metall Isofter than the shell' andi 'projecting somewhat-beyond the shell .barret 'These shells are: initially formedwith the annular'V groove v5- 'therein hav-ing parallel sides. Itisu desirable to undercutfone ofk these sides-as ,shown-atti, Figs, the undercut being for 'the purpos'efol providing 'an anchoring means forthe riding ihand or :collar when it is: rolledor' comlpressed the groove. i'ln's: undercutting has beendone#on-previous screw machines but the .ltoo'lsrby which v'itl has Lbeen vrior-fornieti have lbeen expensive:'toA produce and? requirev complicated :'grmding .steps beyond the skill vof the average tool.grinding-mechanic', requiring special skill and .specialV stock. IOne'of the .advantages of this invention isftoafpermititheuse of commonly used bar .stock ofrectangularsecti'on as shownlin `the `body lportion ofthe tool il. The' cutting edge -B of the tool. isstraight Ian'dfthe `clearance cuts are simply and easily ground. l

The lcarriage -8 i'sxmounted :ona," slide` member Alil: for.: .reciprocating movement, ythe spring Hon' tzacting to..retract'the-carriage and urge it against the. actuating `cam which is not shown. Itbeunderstood that any actuating cam suit- ;abl'e. for [the particular Work` .may lloe used. The

carriagefisprovided with a support il 3 for the tool .holder .slide ftd'. The. 4supportI I3 ismounted for transversefadi ustmentzon Vthe carriage 9 lhy means of the clamps l5 engageahle; in the slots 46 of thercarriage.-

y Y Thefslide `Hl .has ya lostlmotionconnection to the carriage and is urged on its forward stroke ratelyigagedxor adjusted;A `iheslidefis :provided ydesignated generally. by theznumeralw; .The-work ss by f coi'ledspring IS disposed on the threadedi rod: 1M; arranged 'througl'na fhole llB on the arm or 4'brackets 1:9. 'Thisthreaded .rodi I8 has an ad- Jusi'fing:.nur.2li` and a. lock nut 2l so that the 'for- Ward movement. of. the: Stool slide may be 'accuwithan adjustable tappet Z2 which Athe carriage. isunport, or :slideway' member: I3 is engage.- ableon the .return stroke of. thefcarri'afge, thus :re-

tracting thez'tooillholder slide after' anretra'cting ,movement ofthe; carriage.

The tool.haddenK isl lrpivotalliv mounted on. the

tool slide; d 41 which issurmed 'tof receive the shank portionof-thextcol holderiseeligsand .'1) The `tool'lliolder pivot 25 visfrlisposed transversely` to the axis of: theziiwei spindle. .so 'that the tool holder .swingsriim a. plane parallel to the'A axis oi the- Work.

This'toolholderiszprnvidedwithfa cam-surface 26 which is engaged by the cam 21 on the carriage 9 as the carriage approaches the end of its forward stroke, thereby swinging the tool holder on its pivot. The lost motion connection for the carriage to the tool slide permits the spring I6 to advance the tool 'l into the groove to be undercut before the carriage reaches the end of its forward stroke so that as the carriage completes its forward stroke the tool holder is actuated on its pivot to feed the tool to the work with a swinging movement, thereby forming the undercut 6. This forward movement is against the tension of the blade spring 28 which is mounted on the tool slide to engage the tail end of the tool at 29 to receive the same.

The tool holder is provided with an adjustable stop 30 for limiting its retracting movement. This stop is in the form of ascrew, a. spacer 3l being arranged on the screw so that the head 32 of the screw is readily accessible. The stop L screw is arranged through a slot 3,3 and lock nut holds the stop in its adjusted position.

With the parts thus arranged the tool slide, as stated, is advanced by the spring I to its forward position, being determined by the stop means described. This is permitted when the carriage has advanced suilciently to leave the tappet 22.

Continued movement of the carriage brings the cam 2l' into operative position to swing the tool holder on its pivot and thus eiect the undercut. The retracting movement is as described.

The tool is preferably disposed onits holder in a forwardly linclined positionas that permits the use of a tool with a substantially straight `cutting edge. The pivot is positioned so that the tip of. the tool lies in a plane through the pivot 25 and substantially at right angles to the axis ofthe work. This makes it possible toadvance the tool straight int-o the groove to be undercut and the retraction of the tool with a swinging movement without injury to the tip of the tool or to the work. In other words, the tool on its retracting movement completely clears the work. Y. x Y We have illustrated and described our invention in an embodiment thereof especially designed for undercutting grooves inv shells but vthere are various embodiments of the invention .which we contemplate and which areof advantage. It is believed this. disclosure will enable those skilled in the art to embody and adapt our invention as maybe required for particular work.

However, it is especially. desirable for Ywork where undercutting is required. l

Having thus described our invention .what we i claim as new and desire to secure by Letters Patent is: o

1. In a screw machine, the combination with a driven work spindle and a tool carriage mounted for travel in a path transverse to the axis ofthe spindle, of a tool slide mounted on said carriage for movement in a path parallel with the path of travel of the carriage, a spring acting to urge said tool slide toward the work, means for adjustably limiting the forwardmovement of the tool slide under the actionv of the spring, an adjustable tappet on said slide with which the carriage coacts on its returnV stroke to retract the tool slide, a tool holder pivotally mounted on said tool slide for swinging movement in a, plane parallel to the axis of the work, an undercutting tool mounted on said tool holder in a forwardly inclined relation tothe path of reciprocatlon of the tool slide. said tool having a substantially straight cutting edge and being positioned so that its tip is approximately in a plane passing through the axis of the tool holder pivot and substantially at right angles to the axis of the work, a spring on said tool slide acting to retract said tool holder on its pivot, an adjustable stop for limiting the retracting movement of said tool holder under the action of its said retracting spring, and a feed cam on said carriage coacting with said tool holder to swing it on its pivot and thereby feed the tool to the work as the tool carriage is advanced, the retraction of the cam on the return holder, stepped stroke of the carriage permitting said tool holder retracting spring to swing the tool holder on its pivot and thereby clear the undercut of the work. Y '2. In-a screw machine, the combination with .n a driven work' spindle anda tool carriage mountva driven work spindle and a tool carriage mounted for travel in a path transverse to the axis of the spindle, of a tool slide mounted on said cartool holder in a forwardly inclined relation to.

the path of reciprocation of the tool slide, said toolhaving a substantially straight cutting Vedge and being positioned so that its tip is approximately in a plane passingthrough the axis of the tool holder pivot and substantially at right angles to the axis of the work, a spring on said tool slide acting to retract said tool holder on its pivot, and a feed cam on said carriage coacting with said tool holder to swing it on its pivot and thereby feed the tool to the work as the tool carriage is ladvanced, the retraction of the cam onthe return stroke of the carriage permitting said tool holder retracting spring to swing the tool holder on its pivotand thereby clear the undercut of the work,

3. In a screw machine, the combination with ed for travel in a path transverse to the axis of the spindle, of a tool slide mounted on said carriage for movement in a path parallel with the path of travel of the carriage, a spring acting to urge said tool slide toward the work, means for adjustably limiting the forward movement of the tool slide under the 'action of said spring, an adjustable tappet on said slide with which the carrage coacts on its return stroke to retract the" tool slide, a tool holder pivotally mounted on said tool slide for swinging movement in a. plane parallel to the axis of the work, an undercutting tool mounted on said tool holder in a forwardly inclined relation to the path ofreciprocaticn of the tool slide, a spring on said tool slideacting to retract said tool holderI on its pivot,an adjustable stop for limiting the retracting movement of said tool holder under the action of its said retracting spring, and a feed cam on said carriage coacting with said tool holder to swing it on its pivot and thereby feed ythe tool to the work as the too1 carriage is advanced, the retraction of the cam on the return stroke of the carriage permitting said tool holder retracting spring to swing the tool holder on its pivot and thereby clear the undercut of the work.

,4. In a screw machine, the combination with ther spindle;M off' an, tbolislideimoiunted'i on; saidz carriage, for; movement la in; a path'U paralleli witiriy the patl'icofi' travel of; th;...carriage=,y al spring actingfto uitge.l sai'de toch slidetnwa'rd. the,2 work, means; for limitingtlie-forwardf movement of? the tool slide under; thexactionofi` saicl. spring. means 1 on said slide-:with whicltcthe-camiage coacts. om its return stroke;y 'totretractthezztocl slide; aA tooltliold'er; pivetal-ly; mounted-Orr saidl' tool slide fon swinging mnvementf; in aiplaneV paralleli to: the"V axis; of? the reforman undercuttingitool'rk mounted ont said tool hol'derfinzaforwardly inclined relation; to thepath of reciprocation of the tool slide, .a spring-on said toollsl-ide,actingtos.retracttsaid tool holder on its pivot,.andaiffeed canrlorrsaid carriage coacting with saiclztoolhol'dei; tciswing it on its pivot'and thereby feed the tool to the work as the tool carriage is advanced, the retraction of the cam on the return stroke of the carriage permitting said tool holder retracting spring to swing the tool holder on its pivot and thereby clear the undercut of the work. y

5. In a machine of the class described, the combination of a driven work spindle, a tool carriage, a tool slide slidably mounted on said car- ,i

riage for movement to and from the work and having a lost motion connection with said carriage, a spring acting to urge said tool slide toward the Work, means for adjustably limiting the forward movement of the tool slide, a tool holder pivotally mounted on said tool slide for swinging movement in a plane parallel to the axis of the work, a tool positioned so that its tipis approximately in a plane passing through the axis of the tool holder pivot, such plane being parallel tc the path of travel of the tool carriage and substantially at right angles to the axis of the work, cam means coacting with said tool holder to swing it on its pivot after the tool slide has -reached the end of its forward stroke and thereby swingingly feed said tool to the work, a spring carried by said tool slide and acting in opposition to said cam means to retract said tool holder on its pivot prior to the retracting movement lof the slide, and

'an adjustable stop for limiting the retracting movement of said tool holder on its pivot under the action of its retracting spring.

6. In a machine of the class described, the combination of a driven work spindle, a tool carriage, a tool slide slidably mounted on said l' carriage for movement to and fro-m the work and having a lost motion connection with said carriage, a tool holder pivotally mounted on said tool slide for swinging movement in a plane parallel to the axis of the work, a tool positioned so i that its tip is approximately in a plane passing through the axis of the tool holder pivot, such plane being parallel to the path of travel of the tool carriage and substantially at right angles to the axis of the work, means coacting with said tool holdery to swing it on its pivot after the tool slide has reached the end of its forward stroke and thereby swingingly feed said tool to the work and means for swinging said tool holder on its pivot prior to the retracting movement of the slide.

7. In a machine of the class described, the combination of a driven `work spindle, a tool carriage, a tool slide slidably mounted on said carriage for movement to and from the work and having a lost motion connection with said carriage, a tool holder pivotally mounted on said tool slide for swinging movement in a plane parallel to the axis of the Work, a tool having a substantially straight cutting edge and being pocombinationV oit-al driven'.workA spindlaz. atool carriagegl. a, too-ll. `Vslide; slidably mounted om: said caiuziagezfon movement totandefrom thezwork .and having'. a lastu motiom connectiorr with: said; care riage, a tool holder pivotally mounted on said tool slide for swinging movement in a plane parallel to the axis of the work, a tool having asubstantially straight cutting edge and being positioned so that its tip is approximately in a plane passing through the axis ofthe tool holder pivot, such plane being parallel to the path of travel of the tool carriage and substantially at right angles to the axis of the work, means coacting with said tool holder to swing it on its pivot after the tool slide has reached the end of its forward stroke and thereby swingingly feedsaid tool to the work and means for swinging said tool holder on its pivot prior to the retracting movement of the slide.

9. In a machine of the class described, the combination with a driven work spindle and a tool carriage operatively associated therewith-el tool slide mounted on said tool carriage and having a lost motion connection therewith, a tool holder pivotally mounted on said tool slide, said carriage being provided with a cam for actuating said tool holder on its pivot during the completion of the work stroke of the carriage, the lost motion connection for the carriage to the slide permitting the retraction of said cam prior to the re-l clears the work on the swinging retracting movement of the tool holder.

l0. In a machine of theclass described, the combination with ar driven work spindle and a tool carriage operatively associated therewith, a tool slide mounted on said tool carriage and having a lost motion connection therewith, a tool holder pivotally mounted on said tool slide, said carriage being provided with a cam for actuating said tool holder on its pivot during the completion of the work stroke of the carriage, the lost motion connection for the carriage to the slide permitting the retraction of said cam prior to the retraction of the work tool slide, means for swingingly retracting said tool holder on its pivot during the initial retracting movement of said tool carriage, and an undercutting tool mounted on said tool holder, the tip of said tool being positioned vrelative to the pivot axis of said tool holder so that the tool clears the work on the swinging retracting movement of the tool holder.

11. In a machine of the class described, the combination with a driven work spindle and a tool carriage operatively associated therewith, a tool slide mounted on said tool carriage and having a lost'motion connection therewith, a tool holder pivotally mounted on said'tool slide, said carriage being provided with a cam for'actuating said tool holder on its pivot during the completion of the work strokeof the carriage, the lost motion connection for the carriage to the slide.

ing a lost motion connection therewith, a' spring acting to position the slide in cutting position prior to the completion of the work stroke of the carriage, a tool holder pivotally mounted on said tool slide, said carriage being provided with a cam for actuating said tool holder on its` pivot during the completion of the work stroke of the carriage, the lost motion connection for the carriage to the slide permitting the retraction of' said cam prior to the retraction of the tool slide, and means for swingingly retracting said tool holder on its pivot during the initial retracting movement of said tool carriage. n

ROLAND KINGSINGER. GEORGE PINKHAM. WILLIAM FRIEGEL. 

